Ok so my teacher taught us how to do this but now for a question like this. Can someone tell me how to go about this question?

Find the parametric equations for the surface obtained by rotating the curve y=e^-x, 0 less than or equal to y less than or equal to 2, about the x axis. Thanks again for the help..this site is so helpful!

Sep 25th 2009, 08:34 AM

shawsend

Let

First paramaterize the x-direction with just x. Now consider the y and z as just circles in the y-z plane. The equation for y and z would then be: